/**
 * 
 */
package de.guidoludwig.jtm.server;

import java.sql.Types;

import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.type.StandardBasicTypes;

/** 
 * 
 * @author Arno Raps 
 * found at : http://arnoraps.tweakblogs.net/blog/3146/hibernate-with-sqlite.html
 * replaces Hibernate.STRING by {@link StandardBasicTypes}.STRING
 */ 

public class SQLiteDialect extends Dialect { 
    public SQLiteDialect() { 
        super(); 
       
        registerColumnTypes();         
        registerFunctions(); 
    }

	private void registerFunctions() {
		registerFunction("concat", new VarArgsSQLFunction(StandardBasicTypes.STRING, "",    "||", "")); 
        registerFunction("mod", new SQLFunctionTemplate(StandardBasicTypes.INTEGER,    "?1 % ?2")); 
        registerFunction("substr", new StandardSQLFunction("substr",StandardBasicTypes.STRING)); 
        registerFunction("substring", new StandardSQLFunction("substr",StandardBasicTypes.STRING));
	}

	private void registerColumnTypes() {
		registerColumnType(Types.BIT, "integer"); 
        registerColumnType(Types.TINYINT, "tinyint"); 
        registerColumnType(Types.SMALLINT, "smallint"); 
        registerColumnType(Types.INTEGER, "integer"); 
        registerColumnType(Types.BIGINT, "bigint"); 
        registerColumnType(Types.FLOAT, "float"); 
        registerColumnType(Types.REAL, "real"); 
        registerColumnType(Types.DOUBLE, "double"); 
        registerColumnType(Types.NUMERIC, "numeric"); 
        registerColumnType(Types.DECIMAL, "decimal"); 
        registerColumnType(Types.CHAR, "char"); 
        registerColumnType(Types.VARCHAR, "varchar"); 
        registerColumnType(Types.LONGVARCHAR, "longvarchar"); 
        registerColumnType(Types.DATE, "date"); 
        registerColumnType(Types.TIME, "time"); 
        registerColumnType(Types.TIMESTAMP, "timestamp"); 
        registerColumnType(Types.BINARY, "blob"); 
        registerColumnType(Types.VARBINARY, "blob"); 
        registerColumnType(Types.LONGVARBINARY, "blob"); 
        registerColumnType(Types.BLOB, "blob"); 
        registerColumnType(Types.CLOB, "clob"); 
        registerColumnType(Types.BOOLEAN, "integer");
	} 

    public boolean supportsIdentityColumns() { 
        return true; 
    } 

    public boolean hasDataTypeInIdentityColumn() { 
        return false; 
    } 

    public String getIdentityColumnString() { 
        return "integer"; 
    } 

    public String getIdentitySelectString() { 
        return "select last_insert_rowid()"; 
    } 

    public boolean supportsLimit() { 
        return true; 
    } 

    protected String getLimitString(String query, boolean hasOffset) { 
        return new StringBuffer(query.length()+20). 
            append(query). 
            append(hasOffset ? " limit ? offset ?" : " limit ?"). 
            toString(); 
    } 

    public boolean supportsTemporaryTables() { 
        return true; 
    } 

    public String getCreateTemporaryTableString() { 
        return "create temporary table if not exists"; 
    } 

    public boolean dropTemporaryTableAfterUse() { 
        return false; 
    } 

    public boolean supportsCurrentTimestampSelection() { 
        return true; 
    } 

    public boolean isCurrentTimestampSelectStringCallable() { 
        return false; 
    } 

    public String getCurrentTimestampSelectString() { 
        return "select current_timestamp"; 
    } 

    public boolean supportsUnionAll() { 
        return true; 
    } 

    public boolean hasAlterTable() { 
        return false; 
    } 

    public boolean dropConstraints() { 
        return false; 
    } 

    public String getAddColumnString() { 
        return "add column"; 
    } 

    public String getForUpdateString() { 
        return ""; 
    } 

    public boolean supportsOuterJoinForUpdate() { 
        return false; 
    } 

    public String getDropForeignKeyString() { 
        throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect"); 
    } 

    public String getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable, String[] primaryKey,  boolean referencesPrimaryKey) { 
        throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect"); 
    } 

    public String getAddPrimaryKeyConstraintString(String constraintName) { 
        throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect"); 
    } 

    public boolean supportsIfExistsBeforeTableName() { 
        return true; 
    } 

    public boolean supportsCascadeDelete() { 
        return false; 
    } 
}
